Multiple people have been shot by a gunman wearing a doctor’s coat inside a New York City hospital, sources say, and police are responding to what’s being called an active shooter situation.

Multiple people have been shot by a gunman wearing a doctor’s coat inside a New York City hospital, sources say, and police are responding to what’s being called an active shooter situation.

The rifle-wielding gunman at Bronx Lebanon Hospital was dressed in a white doctor’s-type coat when he shot at least three people shortly before 3 p.m., sources tell News 4.

Sources say they believe the shooter is “down” inside the hospital and the immediate threat has been contained, but the police response remains heavy and cautious as authorities make sure he was a lone actor.

Members of the NYPD’s most-armed units were responding, and police could be seen on the roof of the building at one point with their guns drawn.

A staff member at the hospital tells News 4 it was under lockdown as police helped to bring people out floor by floor.

Chopper 4 over the scene shows a sea of NYPD vehicles gridlocking the streets around the hospital.

The FDNY, meanwhile, says they’ve gotten a report of a smoke condition on the 16th floor of the hospital. They are on standby and not inside the hospital yet. Chopper 4 shows firefighters gathered outside the hospital entrance.

Bronx-Lebanon Hospital Center describes itself as the largest voluntary, not-for-profit health care system in the south and central Bronx.

The 120-year-old hospital claims nearly 1,000 beds spread across multiple units. Its emergency room is among the busiest in New York City.